Drain valve



Aing. 10, 1926;

DRAIN VALVE Filed August 5,

awueM-fom Patented Aug. 10, 1926.

UNITED STATES PATENT OFFICE.

GEORGE S. DAUPHINEE, OE: BROOKLYN, NEW YORK, ASSIGNOR TO THE COOLING 'IOVVER CO. INC., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

DRAIN Application filed August 5, 1921.

My invention relates to improvements in drain valves and the object of my invention is to provide a simple, convenient and efficient valve which will be closed by the pressure of water or the like and will be automatically opened to drain the pipe when the pressure is removed.

I accomplish this object by the device i1- lustrated in the accompanying drawings in which Figure 1 is a sectional view of the device, and

Figure 2 is an elevation of the same.

Similar characters refer to similar parts throughout the several views.

In water pipe systems and the like it is frequently desirable to provide means for automatically draining out the system when it is not in operation, for the purpose of removing accummulations of foreign matter,

the water in the pipes and the like. My improved valve is adapted to be screwed onto the end of a water main by means of internal screw threads 1 or in any other desired manner and comprises a casing 2 in which I provide a discharge port 3 and a reciprocating valve 4. The valve 4 is provided with a stem 5 restin in a suitable extension (3 of the casing 2. K spring 7 in the extension 6 bears against a nut 8 on the stem 5 and serves normally to lift the valve 4 to the elevated position shown in Figure l, a shoulder 4 on the stem, 5 of the valve 4 serves to position the valve 4 below the casing 2 when raised to provide a surface for the action of the water pressure as hereinafter explained.

When the water is admitted through the port 1 under pressure into the casing 2, the pressure of the water upon the top of the valve 4 will depress the valve and thereby VALVE.

Serial No. 489,937.

close the discharge port 3 and the valve will be maintained in this closed position by the pressure of the water. When the pressure is shut off, the valve 4 will be raised by the operation of the spring 7 and the port 3 will be thereby opened thus permitting the water and any accumulations of foreign matter,

debris or the like in the. system to drain off through the port 3.

Having thus described my invention, what I claim is:

1. In a drain valve the combination of a casing, an unobstructed discharge port including a valve seat, a cup valve cooperating with said seat and having a pressure surface,

a valve stem fastened to the pressure surface and slidable thru the casing and having a stop member, a spring adapted to pull the valve away from its seat into said casing to open the valve when the fluid pressure is removed from said pressure surface.

2. In a drain valve the combination of a valve casing, a discharge port therein having a valve seat, a cylindrical cup valve therefor having an end wall closing one end of said cylindrical cup valve and serving as a pressure surface, a spacer member on the end wall, an opening thru said end wall and spacer member, a valve stem fixed in said opening, a stop adjacent the end of said stem, an opening thru the casing opposite said discharge port for reciprocation of said valve stem therein, a helical expansion spring surrounding said valve stem between said stop and casing outside of said casing whereby the valve is normally held open.

In testimony whereof I have signed my name to this specification this 26 day of July 1921.

GEORGE S. DAUPHINEE. 

